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[somogyi <somogyi.gabor AT wigner.hu>]

Wigner FK RMI Elméleti Osztály Szemináriuma
Tisztelettel meghívjuk


                  Lencsés Mátá
                  (Wigner FK)


"The scaling region of the tricritical Ising model"


     címmel tartandó szemináriumára.


Kivonat:



The two-dimensional Ising model with vacancies has a tricritical point 
described by a conformal field theory. Recently we investigated various 
combinations of relevant perturbations of the tricritical point. I will 
present our results for the form factors of the leading and subleading 
order and disorder operators in the integrable thermal perturbation. In 
the ordered phase, there are two degenerate ground states and different 
types of kinks interpolating between them. A small magnetic field lifts 
the degeneracy and confines the kinks to mesons. We found that kinks of 
different types can also form mesons and extended the semi-classical 
method to approximate their masses. Perturbing with the subleading 
magnetic field also leads to degenerate ground states, which can be 
unbalanced by the thermal operator, leading to the confinement of kinks 
not generated by a symmetry-breaking field. In both cases, one can 
simulate the "fate of the false vacuum" as a quantum quench protocol. 
Using the truncated conformal space approach, we showed that the bubble 
nucleation rate is consistent with results in the literature. Finally, I 
will discuss the multicritical generalization of the Yang-Lee edge 
singularity.




Helye: Wigner FK RMI III. ép. Tanácsterem
Ideje: 2023 január 27 péntek  d.u. 14 óra

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                             Somogyi Gábor